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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. Channel
  6. 8000 lbs GTW
Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs
Demco

Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs

Part Number: DM8759933
In Stock
$253.20
Brake Actuator
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Applies your drum brakes on your hard-working trailer. Made in the USA with a corrosion-resistant, self-lubricating lining, so rest assured it'll last for a long time. Weld it, paint it, attach your own coupler, and get back to work! 1-800-940-8924 to order Demco brake actuator part number DM8759933 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (24)
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Demco Brake Actuator - DM8759933

  • Surge Brake Actuator
  • Drum Brakes
  • Channel
  • 8000 lbs GTW
  • Weld-On
  • Farm Trailer
  • Construction Trailer
  • Manual Lockout
  • Demco
  • 3 Inch Channel Tongue

Applies your drum brakes on your hard-working trailer. Made in the USA with a corrosion-resistant, self-lubricating lining, so rest assured it'll last for a long time. Weld it, paint it, attach your own coupler, and get back to work!


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops - no brake controller needed
  • Manual reverse lockout lets you reverse without actuating your trailer's brakes
    • Rotate tab on actuator to left before backing up to activate lockout
  • Adjustable channel has 3 different mounting positions for coupler (sold separately)
    • Channel-down design allows for greater drop
    • Compatible with a lunette ring, clevis, or ball coupler
  • Composite master cylinder is durable and efficient
    • Glass-reinforced nylon construction resists rust and corrosion
    • Large reservoir provides increased capacity for brake fluid
    • Automotive-style diaphragm cap creates completely enclosed system to help prevent contamination of fluid
  • Bearing-like lining inside the actuator eliminates the need for grease or lubricants
  • Breakaway included
  • Heavy-duty steel construction
  • Primed finish lets you give it a custom paint job
  • Weld-on installation
  • Made in the USA


Specs:

  • Application: trailers with hydraulic drum brakes
    • Designed to fit 3" wide trailer tongue
  • Gross towing weight: 8,000 lbs
  • Maximum tongue weight: 800 lbs
  • Channel width: approximately 3"
  • Channel height: 8"
  • Model number: DA91
  • 1-Year warranty


Tech Tip: If don't already have brakes that are free-backing, you'll need to get some. Otherwise, your brakes will keep locking up on you when you're backing up. And trust us on this one - upgrading now will be a lot less work than upgrading your wiring harness and a compatible actuator with an electric lockout.


Back Up Without Locking Up Your Brakes - Manual Reverse Lockout

If dont have either a 5-pole flat connector or your brakes that arent free-backing, youll need some other way to prevent your brakes from locking up on you when youre in reverse. With a manual reverse lockout, this actuator lets you do just that.


Demco actuator with the manual reverse lockout tab engaged to prevent the actuator from engaging

To use it, just rotate the tab on the side of the actuator to the left. Itll prevent the actuator from telescoping. When youre done backing up, youll want to make a good habit out of always remembering to restore the tab to its original position before towing normally.


Adjustable Channel Design

The adjustable channel on this trailer brake actuator allows for ultimate versatility. Mount almost any type of coupler (sold separately) - from a standard ball coupler to a lunette ring or clevis attachment - to fit your specific application. In addition, the 3 mounting positions on the channel let you adjust the height of the coupler. Just place the coupler so that it matches the height of the ball mount or other hitch attachment on your tow vehicle and you will be able to tow your trailer levelly.


This actuator is great for tall trailers. This is because the adjustable channel is positioned so that the mounted coupler can sit below the actuator tube, allowing for a greater drop than with a standard center-mounted channel. As a result, you can line up your tall trailer with your tow vehicle's hitch for a level setup.


Hard Plastic Lining for a Trailer that Sees Hard Labor

Hard plastic lining of the Demco DA91 surge brake actuator

Acetal copolymer is a super-durable plastic, and you'll probably never break it. With a self-lubricating surface that's extremely resilient, smooth, and wears well over time, it's perfectly suited for this actuators inner member to help it glide as it telescopes. In fact, this same material is often used to make plain bearings and even has some automotive applications, making it perfectly suited for a life of hard labor, whether you're on the farm or from one jobsite to the next.


How Does a Surge Brake Actuator Work?

When you're towing, the momentum of your rig pushes and pulls on your hitch ball as you slow to a stop. And with a surge brake actuator, that momentum uses the coupling point to push back on the inner portion of your surge brake actuator, which then compresses the master cylinder inside. As it contracts, it pressurizes your hydraulic brake lines, and ultimately engages your trailer brakes. When you start moving again, your tow vehicle pulls that inner portion back out, allowing the trailers wheels to start rolling again.



8759933 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - Channel Down - 8,000 lbs




California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.6

24 reviews
Applies your drum brakes on your hard-working trailer. Made in the USA with a corrosion-resistant, self-lubricating lining, so rest assured it'll last for a long time. Weld it, paint it, attach your own coupler, and get back to work!

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Quality item for a great price!



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Fast shipping, fair prices, great websi te!



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Item was exactly what I wanted when I got here. Tracking and delivery was easy and accurate. Install went very well as it matched up the old one that I had from 10 years ago. Thanks guys good job



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My order was received really fast. And the the price was the best and I searched. The you etrailer



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Much better than the original. Photos of before and after included



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Easy online ordering and excellent customer service.



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Product matched description and works as intended. etrailer team was very helpful in providing additional information whenever requested.



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I was very pleased.



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24
24

See what our Experts say about this Demco Brake Actuator

  • Replacement Master Cylinder To Convert To Disc Brakes On Demco Hydraulic Brake Actuator DM8759933
    We have either the Replacement Master Cylinder # 5672 or Replacement Master Cylinder w/ Bypass Electric Lockout # DM5918 which will fit the Demco Hydraulic Brake Actuator # DM8759933. While this actuator does have the manual lockout you can install the master cylinder with electric lockout which will save you from having to get out of your vehicle to lockout the brakes. This will use a signal from the reverse circuit which if your trailer has a 4-way you will need a 5-Way # HM37908 to replace...
    view full answer...
  • Recommended Drum Brake Actuator for a Trailer Coupler Wider Than 3 Inches
    That's a great comparison Bob but I am sorry, when they say the Demco Hydraulic Brake Actuator item # DM8759138 fits a 3" channel they mean it. The closest alternative I have is the Demco Hydraulic Brake Actuator w/ Manual Lockout item # DM8759933. Capability and features wise, this is an identical actuator with the only acceptations being this one has to be welded on and it's primed not painted. What kind of trailer do you have and what actuator are you currently using? You can add...
    view full answer...
  • Which Ball Mounts/Accessories Fit Demco Hydraulic Brake Actuator with Adjustable Channel
    The bracket on the end of Demco actuator # DM8759933 is 3 inches wide so you would need to look at accessories that mount to a 3 inch wide or 2-7/8 inch wide opening such as Pro Series coupler # PSA200S0303 or Bulldog coupler # BDA200C0317. These are rated for 8,000 pounds to match the Demco actuator. I have also included a link to all of the channel mount couplers you could use. You can also use lunette ring # DM09557-95, 2-tang clevis # DM05593-97, and pintle/ball hitch # C45920 which...
    view full answer...
  • Replacement Actuator For A Trailer With Kodiak 225 Disc Brakes
    Yes it will be an issue if you use The Demco Hydraulic Brake Actuator # DM8759933 with your disc brakes because it is for a drum brake setup. You will need The Demco Hydraulic Brake Actuator w/ Electric Lockout # DM8759422. This system is a weld on or bolt on actuator that will work well with your Kodiak 225 disc brakes. It has a heavy steel construction that has a channel height of 8 inches and will mount on a 3 inch wide trailer tongue. You can not use a drum actuator on disc brakes...
    view full answer...
  • Will Demco Solenoid Kit DM 5404 work with Demco Hydraulic Actuator DM8759933
    The Demco Solenoid Kit for Brake Actuators with Reverse Lockouts # DM5404 is designed to work with DA10, DA20, and DA91 model Demco hydraulic brake actuators. This kit will work with the Demco Hydraulic Brake Actuator # DM8759933 as it is a model DA91 Demco hydraulic actuator.
    view full answer...
  • Replacement Components For A Damaged Demco DA91Coupler
    Yes the internal components for the Demco Hydraulic Brake Actuator - Drum - Primed - 12" Adjustable Channel Down - 8,000 lbs Item # DM8759432 are the same as your current DA91 coupler. We only offer two with the manual lockout with the adjustable channel but not the adjustable channel down. One is the Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs Item # DM8759933 and the other is Demco Hydraulic Brake Actuator w/ Manual Lockout - Drum - Zinc...
    view full answer...

Do you have a question about this Brake Actuator?


Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Dustin K
Video Edited:
Dustin K

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